Eleventh

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This article is about an eleventh in music theory. For the chord, see Eleventh chord. For the character, see Eleventh Doctor. For the century, see 11th century. For the US constitution amendment, see Eleventh Amendment to the United States Constitution. For 11 July in Northern Ireland, see Eleventh night.
Perfect eleventh on C. About this soundPlay (help·info)
perfect eleventh
Inverseperfect fifth
Name
Other namesCompound fourth
AbbreviationP11
Size
Semitones17
Cents
Equal temperament1700.0
Augmented eleventh on C. About this soundPlay (help·info)
augmented eleventh
Inversediminished fifth
Name
AbbreviationA11
Size
Semitones18
Cents
Equal temperament1800.0

In music or music theory, an eleventh About this soundplay (help·info) is the note eleven scale degrees from the root of a chord and also the interval between the root and the eleventh. The interval can be also described as a compound fourth, spanning an octave plus a fourth.

Since there are only seven degrees in a diatonic scale the eleventh degree is the same as the subdominant.

The eleventh is considered highly dissonant with the third.

A perfect eleventh is an eleventh which spans exactly 17 semitones. It can be also described as a compound perfect fourth, spanning an octave plus a perfect fourth.

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